Rotary pump-sealing means



July 15,1924.- 1,501,051

- E. HILL ROTARY PUMP SEALING MEANS Filed Oct. 25. 1923 2 Sheta-Shcet 14y I INVENTOR /6 Y BY July 15 1924. 1.501,Q5' 'l E. I HLL ROTARY PUMPSEALING MEANS Filed Oct. 25. 1923 2 sheen-shut INVENTOR ATTORNEY A 1.01.051 Fries.-

nssnnznn HILL, or scorn NORWALK, commcricur, asslenoa re turn mm. coma aroute comranmor New YoaK, N. Y., a coaromrron or DELAWARE.

smears.

.To all whom it may concern: i

Be it known that I, EBENEZER HILL, a citizen of the United States,residing at South Norwalk, in the county of Fairfield 5 and State offionnecticut have invented a new and useful Improvement in RotaryPump-Sealing Means, of which the following is a specification.

This invention relates generally to rotary 1o fluid pumps and moreparticularly to the type for pumping or compressing fluids which have a.rotor containing a driving gear. with internal teeth and a driven gearwith a different number of external teeth, the latter gear beingeccentrically mounted within the former gear and the teeth sointermeshing that the rotation of the gears compresses and dischargeswhatever fluid is admitted between the gear teeth.

Pumps of this character have been provided with a ported sealing plateand means for causing the discharge pressure of the pump to be soexerted on the plate as to force it against the faces of the rotor andgears and prevent leakage of the fluid being pum ed across the ends ofthe teeth, and. they ave also been provided with means for causing thedischarge pressure of the pump to be so exerted on the back of the rotoras to press the rotor and gears forward against the sealing surfaceswhereby the wearing surfaces have been sealed according to the pressureproduced by the pump. I The object of the present invention isto arrangemeans in pumps of this nature by which in a simple manner the sealingengagement of the wearing surfaces and the amount of wear can beeffectively controlled, which means cheapen the construction and .40 soact as to automatically take up all wear that may occur, and can beinexpensively and quickly refitted-should the wear become .excessive asa result of long and hard use.

. This object is attained by placing a metal as wearing ring in thepumping chamber around the outside of the edge of the rotor in suchposition that the outer edge of the ring will be in the same plane asthe outer edge of the rotor and the exposed faces of the gears, wherebythe sealing plate will bear agamst these elements equally and the wear,

onthe parts will be uniform.

In the accompanying drawings Figure 1 shows a longitudinal section of apump constructed according to this invention; Fig.

2 is a detail on larger scale showing the manner in which thesealing-and wearing parts engage. Fig. 3 shows a face view of the pumpwith the head removed and a portion of the sealing plate broken away.Fig. 4' is 60 V a section on the plane indicated by the dotted line 4A=on. Fig. 1.

The casing 1 is generally cylindrical in transverse section and it has ahead 2 secured-insuch manner that it may be reas .an intake opening 3and in the other side of the casing is a discharge opening 4. The intakeopens opposite the intake port 5 in the sealing plate 6, while thedischarge communicates with apassage 7 in the head that opens oppositethev discharge port 8 through the sealing plate. The cylindrical rotor9, which is fitted in E5 the pumping chamber 10 so that it may have alongitudinal as well as a rotary movement therein, has a hub 11 that issupported b anti-friction bearings 12. The driving sha 13 is splined .tothe rotor hub so that it will turn the rotor without obstructing itslongitudinal movement. A stufiing box 14' is arranged to prevent leakageabout the the sealing plate by nut 20, and its axis is eccentric to theaxis of the driving shaft, so thatv the inner gear will be eccentric tothe outer gear, as is well understood in pumps of this class.

' In a recess in the pumping chamber and encircling the outer edge ofthe rotor is a.

ring 21 This ring is made so wide that its outer face will be in exactlythe same plane as the outer end of the rotor and the exposed faces ofthe intermeshing gears.

The sealing plate has an axial movementin the chamber in the casingtoward the rotor, gears and sealin ring, being normally pressedagainstthe aces of these part by 'a spring 22. The outer end of thesealing plate is preferably provided with packing rings 23 thatfit thecircular innerwall of the chamber. The discharge port 8 in the sealingplate is desirably elongated and is positioned so as to extend at thesides of the gears adjacent to the locality Where the teeth bottom,while the intake port 3 in the sealing plate is shown as having aplurality of openings opposite the locality where the crests of theteeth of the gears contact. (Fig. 3). The chamber 15 back of the rotorhas a connection 23 leading from the receiver 24 into which the fluidcompressed. by the pump passes from the discharge.

With the construction described discharge premure is admitted to thechamber 15 and is exerted on the back of the rotor so as to tend toforce the rotor" and the gears forward, and discharge pressure fillingthe space in a chamber in front of the sealing plate forces the sealingplate backward a ainst the rotor, gears and sealin ring.

hen the pump is starting up and t ere is no discharge pressure thesealing plate is pushed up against the sealing ring and the faces of thegears by the spring. As the pressure builds up, it forces the sealingplate back against the sealing ring and the rotor and gears, andcoincidently forces the rotor and gears forward against the sealingplate. If there is any wearing friction either the sealing plate or thegears will be slightly worn, and as the sealin ring will hold the platein a definite position, in case any wear take place on either part, thepressure against the sealing plate will push the sealing plate againstthe ring, and the pressure back of the rotor will push the rotor andgears against the sealing plate. The amount of Wear in any event isextremely slight, but it practically ends as soon as the parts are wornso that the edge of the ring and the edge of the rotor and the faces ofthe gears are in the same plane. If it is desirable to bring the sealingplate in a closer proximity to the faces of the gears all that it isnecessary to do is to remove the ring and polish it so as to remove afraction of a thousandth of an inch of its width and then reinsert it.With this simple construction the sealing engagement of the parts andthe amount of friction, and consequently the extent of wear, is underexact control.

The invention claimed is 1. A rotary pump having a casing containing achamber, co-acting pumping members rotatably mounted in said chamber, asealing ring removably located in the chamber and encircling the pumpinmembers,a plate axially movable in the c amber, and means whereby saidplate is pressed against the pumping members and said ring.

2. A rotary pump having a casing containing a chamber, co-acting pumpingmembers rotatably mounted in said chamber, a sealing ring removablylocated in the chamber and encircling the pumping members,

vmeans permitting fluid pressure to be exerted on said plate and forceit against the pumping members and said ring.

4. A rotary pump having a casing containing a chamber, coacting pumpingmembers rotatably mounted in said chamber, a sealing ring removablylocated in the chamber and encircling the pumping members,

a plate axially movable in the chamber, a spring pressing said plateagainst the pumping members and said ring, and means for admit-tingfluid pressure against said plate and supplementing the pressure of thespring.

5. A rotary pump having a casing containing a chamber, co-acting pumpingmembers rotatably mounted in said chamber, a sealing ring removablylocated in the chamber and encircling the plate axially movable in thechamber, means pressing said plate against said ring, and means wherebythe pumping members are pressed against said plate.

6. A rotary pump having a casing containing a chamber, co-acting pumpingmembers rotatably mounted in said chamber, a sealing ring removablylocated in the chamber and encircling the pumping members, a plateaxially movable in the chamher, and means for admitting dischargepressure to each end of the chamber and causing it to be exerted inopposing directions so as to force the. pumping members and plate towardeach other.

7. A rotary pump having a casing con-, taining a chamber, co-actingpumping members rotatably mounted in said chamber, a sealing ringremovably located in the chamber and encircling the pumping members, aplate axially movable in the chamber, means adapted to press said plateagainst said ring, and means adapted. to press said pumping membersagainst said plate.

8. A rotary pump having a casing containing a chamber, co-acting pumpingmembers rotatably mounted in said chamber, a sealing ring removablylocated in the chamber and encircling the pumping members, aplateaxially movable in the chamber, a spring pressin said plate againstsaid ring, means for a mitting discharge pressure against said plate andsupplementing the pressure of the spring, and means for admittingdischarge pressure and forcing the pumping members against the plate.

9. A rotary pump having a casing conpumping members, a

means permitting fluid said ring.

taining a chamber, a rotor and co-actin 4 pumping gears rotatablymounted in sai chamber, a sealing ring removably located in the chamberand encircling the rotor, a plate axially movable in the chamber, and

ressure to be exjerted on said plate an force it against 10. A rotarypump having a casing containing a chamber, a rotor and co-acting pumpinggears rotatably mounted in said chamber a sealing ring removably locatedin the c amber and encircling the rotor, a plate'iaxiall movable in thechamber, a spring pressmg said plate against said ring, means foradmitting fluid pressure against said plate and supplementing'thepressure of, the spring, and means for admitting fluid pressure againstthe rotor and forcing it 20 and the gears against said plate. I

taining a chamber, co-acting pumpinggears 11'. A rotary pump havingacasing con rotatably mounted in said chamber, a seal= ing ringremovably located in the: chamber and encircling said gears, a portedplate axially, movable in the chamber, and means 12. A rotary pumphaving acasing containing a chamber, a rotor and vco-aoting exerted onsaid plate and force it against" said ring, and means for permittingfluid pressure to be exerted ,on said rotor and force it and the gears a'ainst said EB NEZER adapted to press said plate against said ring; v

Elite. 6

